Sweet car. Lots of threads about this. Just the normal Mopar steering wheel slop. The borgeson box helps eliminate the slop but it’s around 1k for the kit. I have a PST 16:1 box in my 65 dart manual steering, little hard at low speeds.
I have Doug’s headers D453 for my small block 67 Belvedere. I bought a TTI 2.5 X pipe kit with using my own mufflers. I got the header adapter kit from TTI, it’s a real nice fit. Dustin.